Michael, I don't know of a bundled macro for creating a network graph but the Global Reports (https://confluence.atlassian.com/display/DOC/Global+Reports+Macro) macro "displays a list of links to some reports about content on your site. These reports include a list of new or updated pages, orphan pages, undefined pages, and RSS feeds for new pages and blog posts."
I actually wrote a user macro to create a network graph of all the pages in a particular space (based on incoming links to a page). I'm not sure if I want to make it public for everyone yet, so maybe if you send me an e-mail at email@example.com I can send it to you for you to try it out.
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