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)(14,18)(15,19)(21,22)(23,24)(25,29)(26,27)(28,32)(30,31)(33,34)(35,36) involution — undirected(5,7,10,12)(6,11,8,9)(13,14,17,18)(15,20,19,16)(22,27)(23,28)(29,36)(30,33)(6,8)(9,11)(13,15,17,19)(14,16,18,20)(21,23,26,28)(22,24,27,32)(25,33,35,30)(29,34,36,31)(1,2)(3,4)(5,8,10,6)(7,9,12,11)(13,16)(14,15)(17,20)(18,19)(21,24)(22,28)(23,27)(25,34)(26,32)(29,30)(31,35)(33,36)(5,9)(6,12)(7,8)(10,11)(13,14)(15,20)(16,19)(17,18)(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.