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)(19,24)(20,29)(21,26)(22,31)(23,27)(25,28)(30,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,10)(11,15)(12,16)(13,14)(17,19,23,22)(18,24,27,31)(20,30,21,28)(25,29,32,26)(10,14)(15,16)(17,20,23,21)(18,25,27,32)(19,28,22,30)(24,26,31,29)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(17,21,23,20)(18,26,27,29)(19,28,22,30)(24,25,31,32)(3,8)(5,7)(9,12,13,11)(10,15,14,16)(17,19,23,22)(18,24,27,31)(20,28,21,30)(25,26,32,29)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.