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