I am using Eclipse Luna for Parallel Application Developers v4.4.2 with Subversive 2.0.4 and cannot see any option to show the revision graph from the context menu on my svn repo within SVN Repository Exploring. Also, there should apparently be a voice in the Eclipse preferences under Team>SVN, but there is none.
Any ideas where this has gone? I used to use it in a previous Eclipse version.
The Revision Graph functionality is provided as a separate plug-in. If you didn't install it yet, then please try installing it first. Then, after restart, I expect the option to be present in the context menus.