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