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