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