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