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