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)(7,11)(8,10)(9,12)(13,14,17,20)(15,21,22,28)(16,24,26,19)(18,25,27,23)(5,7)(6,9)(8,12)(10,11)(15,22)(18,27)(21,28)(23,25) involution — undirected(7,12)(9,11)(13,15,17,22)(14,18,20,27)(16,25,26,23)(19,28,24,21)(6,10)(9,11) 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.