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