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