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