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