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