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