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