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