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