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