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