One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,11,7,12,6,10)(3,13,9,16,15,4,14,8)(17,18)(19,23,26,31)(20,22)(21,25)(24,28)(27,29,32,30)(1,3)(2,8)(4,10)(5,9)(6,14)(7,15)(11,13)(12,16)(18,22)(19,26)(20,28)(23,30)(24,25)(29,31) involution — undirected(1,4,5,8,7,13,6,16)(2,9,10,3,12,14,11,15)(17,19,20,27,21,26,28,32)(18,23,24,30,25,31,22,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.