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