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