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