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