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