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