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