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)(14,18)(15,21)(19,23)(20,24)(22,28)(25,27)(6,9)(7,11)(13,14,17,18)(15,19,23,21)(16,24,26,20)(22,28,25,27)(13,15,18,21,17,23,14,19)(16,25,24,27,26,22,20,28)(5,7,8,11)(6,10,9,12)(13,16,17,26)(14,20,18,24)(15,22,23,25)(19,27,21,28)(1,3,4,2)(6,9)(10,12)(13,14,17,18)(15,21,23,19)(16,24,26,20)(22,27,25,28)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.