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)(13,14,20,16,19,23,18,28)(15,24,27,17,22,21,26,25)(5,7,10,6)(8,11,9,12)(13,15,18,26,19,22,20,27)(14,21,28,17,23,24,16,25)(2,4)(13,16,20,23,19,28,18,14)(15,25,27,24,22,17,26,21)(5,8,10,9)(6,11,7,12)(13,17,19,25)(14,22,23,15)(16,26,28,27)(18,24,20,21)(5,9,10,8)(6,11,7,12)(13,18,19,20)(14,16,23,28)(15,26,22,27)(17,21,25,24)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.