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