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