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