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