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