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