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