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