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