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