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