Unfortunately, the Owners Manual does not have a single image of all the controls and switches.
I did pull out an image of the switch location for you though.
Here is the description from the manual,
TRANSMISSION NEUTRAL LOCK - The transmission neutral lock is located on the left side of the front dash.
LOCKED - Move the transmission direction control lever to the NEUTRAL position. Press the top of the switch in order to lock the transmission direction control lever into the NEUTRAL position.
UNLOCKED - Press the bottom of the switch in order to deactivate the transmission neutral lock.
Note: If the transmission neutral lock has been activated, you must shift the direction control lever into the NEUTRAL position before you shift the direction control lever into the FORWARD position. If the transmission neutral lock has been activated, you must shift the direction control lever into the NEUTRAL position before you shift the direction control lever into the REVERSE position. The direction control lever must be shifted into the NEUTRAL position in order to allow movement of the machine.
Note: When you exit the machine push the top of the transmission neutral lock switch in order to prevent the machine from moving out of the NEUTRAL position. Engage the parking brake in order to prevent machine movement when the transmission is in neutral. Refer to the Operation and Maintenance Manual, "Transport Positions".
To the left of this switch should be the All Wheel Drive switch and the far left is the Hazard (flasher)switch. Above it is the turn signal switch.
It is always recommended a copy of the Owners manual be kept with the machine. It is a great reference for service personal and operators and a key component of any safety plan.
You can order them from the CAT website or the dealer. This book is not a service manual and is much cheaper.
Operation and Maintenance Manual
416C, 426C, 428C, 436C and 438C Backhoe Loaders
Media Number -SEBU6873-05
If you need more help with this, please let me know. I will be glad to help.