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