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