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