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