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