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