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