Katherine Ognyanova proposes a detailed tutorial for network visualization.
1. Basics for Network visualization: goals, types, etc
2.Data format, size and preparation
3.Data set 1 and Data set 2
4. Network visualization with igraph
Also the code and data can be dowloaded from:
Download this tutorial as a PDF file.
Download the example datasets and R code this tutorial uses.
The code and data are also available on GitHub.
Read more at: http://kateto.net/network-visualization