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