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