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