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