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