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