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