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