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