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