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