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