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