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