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