Usually, I would say try a service like http://www.cachedpages.com/ - different platforms cache pages for different lengths of time, and Google will usually store pages for around a week at least.
However, because Facebook has privacy settings that means the page's aren't always indexed by Google (unless the privacy settings are switched off), it really depends how you had things set up...
I would also recommend trying your browser cache, this may be a more viable option.
Again though, if the page was secure - there's a good chance that Facebook cached page won't be accessible.
Good luck.