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