Network Visualization with Gephi by Katya Ognyanova.
It’s not possible to cover Gephi in sixteen (16) pages but you will wear out more than one printed copy of these sixteen (16) pages as you become experienced with Gephi.
This version is from a Gephi workshop at Sunbelt 2016.
Katya‘s homepage offers a wealth of network visualization posts and extensive use of R.
Follow her at @Ognyanova.
PS: Gephi equals or exceeds visualization capabilities in use by the NSA, depending upon your skill as an analyst and the quality of the available data.