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