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