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