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