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