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)(10,12)(13,14,19,23)(15,24,21,27)(16,26,20,25)(17,22,18,28)(1,2,3,4)(13,15,19,21)(14,20,23,16)(17,26,18,25)(22,27,28,24)(13,16,19,20)(14,21,23,15)(17,27,18,24)(22,26,28,25)(5,7,8,11)(6,10,9,12)(13,17,19,18)(14,22,23,28)(15,25,21,26)(16,27,20,24)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.