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