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