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