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