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