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