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