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)(13,14)(15,25)(16,23)(17,20)(18,21)(19,24)(22,27)(26,28)(2,3)(5,7)(6,9)(8,11)(10,12)(13,15,16,26,19,27,18,17)(14,20,21,22,24,28,23,25)(1,2,4,3)(13,16,19,18)(14,21,24,23)(15,17,27,26)(20,25,28,22)(1,3,4,2)(7,11)(9,12)(13,16,19,18)(14,21,24,23)(15,26,27,17)(20,22,28,25)(13,17,18,27,19,26,16,15)(14,22,23,20,24,25,21,28)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.