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