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