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