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