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