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