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