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