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