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