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