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