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