Links to Google's cached versions of web pages are tucked away in the instant preview, requiring you to mouse over the search result and expand the preview to get to those cached pages. For more direct access to cached pages, all you need to do is type in "cache:" before the website address.
The Digital Inspiration blog notes that you can use the "cache:" operator both in the search box on Google.com or, if you're using Chrome, in the omnibox.
This will help you skip the step of visiting Google and navigating to the instant preview whenever a site goes down or is taking too long to load.
Quickly Open Google Cached Pages in Chrome [Digital Inspiration]