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)(13,14,20,27,19,25,18,24)(15,26,17,21,28,16,22,23)(5,6)(7,11)(8,10)(9,12)(13,15,19,28)(14,21,25,23)(16,27,26,24)(17,20,22,18)(2,4)(5,7,8,12)(6,9,10,11)(13,16)(14,22)(15,27)(17,25)(18,21)(19,26)(20,23)(24,28)(7,12)(9,11)(13,17,18,15,19,22,20,28)(14,23,24,16,25,21,27,26)(6,10)(9,11)(13,18,19,20)(14,24,25,27)(15,17,28,22)(16,23,26,21)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.