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