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