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