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