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