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