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