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