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