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