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