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