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