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