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