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