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