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