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