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