I believe this may actually be possible, but honestly I haven’t tested it.
But maybe you can be a guinea pig If you’ve installed the LLVM toolchain (so that it shows up as an option in Visual Studio’s project settings), then you can run cmake -G “Visual Studio 12” -T LLVM-vs2013
Source: http://www.cmake.org/Bug/bug_relationship_graph.php?bug_id=14458&graph=relation