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