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