One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,14,20,24)(15,25,16,28)(17,22,21,27)(18,23,19,26)(6,9)(10,12)(13,15,19,22,20,16,18,27)(14,21,23,25,24,17,26,28)(5,7,8,11)(6,10,9,12)(13,16,19,27,20,15,18,22)(14,17,23,28,24,21,26,25)(1,3,4,2)(13,17)(14,22)(15,26)(16,23)(18,25)(19,28)(20,21)(24,27)(13,18,20,19)(14,23,24,26)(15,27,16,22)(17,28,21,25)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.