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