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