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