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