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