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