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