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