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