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