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