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)(13,14,18,22)(15,23,26,28)(16,20,17,21)(19,24,27,25)(2,4)(13,15,18,26)(14,19,22,27)(16,25,17,24)(20,28,21,23)(5,8,10,9)(6,11,7,12)(13,16,18,17)(14,20,22,21)(15,24,26,25)(19,23,27,28)(5,9,10,8)(6,11,7,12)(14,21)(16,17)(19,23)(20,22)(24,25)(27,28)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.