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