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