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