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