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