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)(12,14)(13,16)(18,23)(19,25)(24,31)(26,28)(1,3,6,5)(2,7,4,8)(9,10,12,14)(11,13,16,15)(17,18)(19,21)(20,24)(22,23)(25,30)(26,29)(27,31)(28,32)(2,4)(3,5)(9,10)(11,13)(12,14)(15,16)(19,25)(20,27)(21,30)(24,31) involution — undirected(1,3,6,5)(2,7,4,8)(9,11)(10,13)(12,16)(14,15)(17,19)(18,21)(20,28)(22,25)(23,30)(24,32)(26,27)(29,31)(1,4,6,2)(3,7,5,8)(17,20)(18,24)(19,26)(21,29)(22,27)(23,31)(25,28)(30,32)(1,5,6,3)(2,7,4,8)(17,21)(18,19)(20,29)(22,30)(23,25)(24,26)(27,32)(28,31)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.