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