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