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