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