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