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