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