One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6,10,15,11,16,24,33)(7,17,20,32,22,31,21,12)(8,23,19,35,26,34,25,13)(9,27,28,30,29,14,18,36)(5,7)(6,12)(8,9)(10,21)(11,22)(13,14)(15,31)(16,32)(17,33)(18,19)(20,24)(23,30)(25,28)(26,29)(27,35)(34,36) involution — undirected(5,8,24,19,11,26,10,25)(6,13,33,23,16,35,15,34)(7,18,20,29,22,28,21,9)(12,30,17,27,32,36,31,14)(5,9,24,18,11,29,10,28)(6,14,33,30,16,27,15,36)(7,19,20,26,22,25,21,8)(12,23,17,35,32,34,31,13)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.