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