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