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