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)(11,12)(13,15)(14,16)(17,18,20,22)(19,21,23,24)(27,31)(30,32)(1,3,5,8)(2,4,6,7)(9,11,13,16)(10,14,15,12)(25,26,29,28)(27,32,31,30)(2,6)(4,7)(9,12,13,14)(10,11,15,16)(17,18)(19,21)(20,22)(23,24)(25,27,29,31)(26,30,28,32)(1,4,5,7)(2,3,6,8)(9,12)(10,11)(13,14)(15,16)(17,19,20,23)(18,21,22,24)(25,28,29,26)(27,32,31,30)(1,3)(2,7)(4,6)(5,8)(9,10)(11,12)(13,15)(14,16) involution — undirectedA 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.