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