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