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