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