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