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