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