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