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