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