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