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