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