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