Drawing your graph models on a whiteboard is cool but hard to take with you. Other drawing are also just static art. Describing your models in prose is verbose and hard to understand.
Learn Hands-On how to use the Power of Ascii-Art Querying with Cypher, d3-Visualization, AsciiDoctor-Live-Rendering, GitHub Gists and Javascript as the glue to render interactive, live graph models directly in your browser. Literate Programming at its best.
Look at the GraphGist Collection at http://gist.neo4j.org for a huge list of impressive graph models.