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