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)(11,16)(12,15)(13,14)(17,18,24,28)(19,22,27,23)(20,25,21,26)(29,32,30,31)(2,5)(6,7)(10,14)(11,12)(17,19,23,18,24,27,22,28)(20,30,31,26,21,29,32,25)(1,3,4,8)(2,6,5,7)(9,11,13,12)(10,15,14,16)(17,20)(18,25)(19,29)(21,24)(22,32)(23,31)(26,28)(27,30)(9,12,13,11)(10,15,14,16)(17,21,24,20)(18,26,28,25)(19,30,27,29)(22,31,23,32)(10,14)(15,16)(17,22,24,23)(18,19,28,27)(20,31,21,32)(25,30,26,29)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.