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