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