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