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