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