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