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)(13,14,19,24)(15,20,16,22)(17,27,26,21)(18,28,25,23)(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,15,19,16)(14,20,24,22)(17,18,26,25)(21,23,27,28)(6,9)(10,11)(13,16,25,17,19,15,18,26)(14,21,28,20,24,27,23,22)(5,7,8,12)(6,10,9,11)(13,17,18,16,19,26,25,15)(14,22,23,27,24,20,28,21)(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.