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