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