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