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