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