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