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