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