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