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)(13,14,19,23,18,21,17,24)(15,25,16,20,26,28,27,22)(5,6)(7,10)(8,11)(9,12)(13,15,18,26)(14,20,21,22)(16,19,27,17)(23,25,24,28)(1,2,3,4)(5,7,10,6)(8,11,9,12)(14,21)(15,26)(16,27)(23,24)(5,8,10,9)(6,11,7,12)(13,16,17,15,18,27,19,26)(14,22,24,28,21,20,23,25)(5,9,10,8)(6,11,7,12)(13,17,18,19)(14,23,21,24)(15,27,26,16)(20,28,22,25)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.