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