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