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