I got an external forums which will help you and i understand onething that viewing caches of safari is a painful job
In the forum one asked to install Xcode, Here it is
Another cool website that contains a cache view tool
In this site the described tool is Momento and here is its download link
___________________________________________________________________The best one and most posted on many websites is this
I think it has many features including extracting files from Safari Cache.Must Try it
I collected many informations for you. Now you can do from here.
If you satisfied with my answers please accept my answer and give a good feedback to me