I'd like to present you a prototype of Visual Studio plugin which was developed by a student from my university as a coursework. Yielding floor to her:
GraphAlgorithmRenderer is an experimental Visual Studio extension for debugging and visualizing graph algorithms. It takes a description of graph nodes, edges and their properties, such as color and label, and renders a corresponding graph. The graph is refreshed automatically when you step in debugger. Graph config can be serialized to JSON and deserialized back.