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