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