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