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