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