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