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