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