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