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