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