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