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