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