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