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