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