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