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