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