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