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