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