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