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