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