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