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