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