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