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