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