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