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