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