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