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)(13,14,18,22)(15,19,24,27)(16,25,23,28)(17,20,26,21)(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,15)(14,19)(16,17)(18,24)(20,25)(21,28)(22,27)(23,26)(6,9)(10,11)(13,16,26,24,18,23,17,15)(14,19,20,28,22,27,21,25)(5,7,8,12)(6,10,9,11)(13,16,26,24,18,23,17,15)(14,19,20,28,22,27,21,25)(1,3,4,2)(13,17,18,26)(14,20,22,21)(15,16,24,23)(19,25,27,28)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.