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