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