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