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