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