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