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