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