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