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