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)(13,14,20,15,19,17,18,22)(16,24,26,25,28,21,27,23)(5,6)(7,11)(8,10)(9,12)(13,15,19,22)(14,18,17,20)(16,25,28,23)(21,26,24,27)(2,4)(5,7)(6,9)(8,12)(10,11)(13,16)(14,21)(15,23)(17,24)(18,27)(19,28)(20,26)(22,25) involution — undirected(7,12)(9,11)(13,17,18,15,19,14,20,22)(16,21,27,25,28,24,26,23)(6,10)(9,11)(13,18,19,20)(14,22,17,15)(16,26,28,27)(21,23,24,25)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.