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