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