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