Reminds me of a hackathon submission I did for a Neo4j Hackathon. I remember winning some money :)

https://www.youtube.com/watch?v=RTsnSxyO6MY

It will be great if you are able to run tests on the codebase and watch the entire graph light-up in different colors. This is much cooler way to depict test coverage and also identify the most heavily used part of the codebase.