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