One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,12)(5,8)(6,11)(7,14)(10,16)(13,15)(17,18)(19,27)(20,26)(21,25)(22,24)(23,28)(29,31)(30,32) involution — undirected(6,15)(9,16)(17,19,22,30)(18,23,24,31)(20,29,21,28)(25,32,26,27)(1,3)(2,6)(4,13)(5,10)(7,16)(8,15)(9,12)(11,14)(17,18)(19,27)(20,26)(21,25)(22,24)(23,28)(29,31)(30,32) involution — undirected(18,24)(23,31)(25,26)(27,32) involution — undirectedA 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.