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