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