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