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