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