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