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