Network diagrams are a great way to visualize the relationships between entities in your source material. It can sometimes help to explore materials from different angles to uncover new patterns and understanding.
If you're looking for more types of visualizations, you can find more information about data visualization generally at the corresponding library guide: https://guides.nyu.edu/viz/.
We support Gephi at Data Services. The Gephi community is also very active and maintains a lot of tutorials to help you get started: