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