http://lonnie.io/gostd/dagvis/
If you write your project that even has no circular deps among files and all files are small (like me in https://github.com/h8liu/e8vm), you can draw the similar graph but at a much finer granularity, like this:
http://8k.lonnie.io/
Here are my hand-made tools to generate those stuff: https://github.com/h8liu/e8tools
Javascript version (I actually wrote this first for go std lib): https://github.com/h8liu/dagvis