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