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