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