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