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