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)(15,16,20,22,19,24,18,23)(17,21,27,28,25,29,26,30)(3,4,5,6)(8,11)(12,14)(15,17)(16,21)(18,26)(19,25)(20,27)(22,28)(23,30)(24,29)(4,6)(9,13)(12,14)(16,22)(18,20)(21,28)(23,24)(26,27)(29,30) involution — undirected(7,9,10,13)(8,12,11,14)(17,25)(21,29)(26,27)(28,30)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.