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