This module is an extension using a different namespace. It provides attributes for coloring in RGBA, positioning inside a 3D space, setting size, color, position and shape of nodes and edges.
<?xml version="1.0" encoding="UTF-8"?>
<gexf xmlns="" xmlns:viz="" xmlns:xsi="" xsi:schemaLocation="" version="1.3">
            <node id="a" label="glossy">
                <viz:color r="239" g="173" b="66" a="0.6"/>
                <viz:position x="15.783598" y="40.109245" z="0.0"/>
                <viz:size value="2.0375757"/>
                <viz:shape value="disc"/>

Color can also be represented using hex representations

<viz:color hex="#FF0022"/>

Get more details on how to get your graphs stylish in the Primer.

And finally see some real examples with our datasets.