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