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