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