I doubt that you will find anything that integrates with Visual Studio, but you might be interested in AsciiFlow , an ASCII online stream, chart generator (which you can copy-paste into your comments).
Given the above, that you have, in essence, architectural documentation there. Such large-format documentation should (almost) never be part of the commentary. Comments should be concise, concise and accurate (especially if they work in a team). For more information, read one of the many resources (one of the popular here is the Google C ++ Style Guide ).
Technological diagrams, etc. are much better suited as part of supporting documentation (such as a project document or API documentation) that is fully human-readable - it doesnโt dig deep into the source files.
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