One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(7,8)(9,12)(10,11)(13,14)(15,16,20,23,19,22,27,30)(17,18,25,26,24,21,29,28)(3,4,5,6)(8,11)(12,14)(15,17)(16,21)(18,22)(19,24)(20,25)(23,28)(26,30)(27,29)(4,6)(9,13)(12,14)(15,18)(16,17)(19,21)(20,28)(22,24)(23,29)(25,30)(26,27) involution — undirected(7,9,10,13)(8,12,11,14)(17,24)(18,21)(25,29)(26,28)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.