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