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