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