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