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