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