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