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