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