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