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