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