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