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