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