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