Normally the format of a URL in Google's cache is:
Where xxxxx is a hash of the URL and yyyyy is the address itself.
You can access the cache of specific URL by omitting the hash part and simply using the url:
This is also possible without editing the url, by searching google for "cache:google.com"
To highlight terms within the cache'd page, add them on to the end of the search query, for example: "cache:google.com news" will highlight the word "News"