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