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)(11,14)(12,15)(13,16)(17,18,21,23)(19,25,27,32)(20,29,26,24)(22,30,31,28)(9,11)(10,13)(12,16)(14,15)(17,19,26,30,21,27,20,28)(18,22,29,32,23,31,24,25)(1,3,4,8)(2,5,6,7)(11,16)(13,14)(18,23)(19,27)(24,29)(28,30)(9,11)(10,14)(12,16)(13,15)(19,27)(22,31)(25,32)(28,30) involution — undirected(11,16)(13,14)(19,27)(22,31)(25,32)(28,30) 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.