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