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)(21,22,25,28)(23,27,30,36)(24,32,34,29)(26,33,35,31)(5,6,9,12)(7,13,14,10)(8,17,16,11)(15,18,20,19)(21,23,24,31,25,30,34,33)(22,26,29,27,28,35,32,36)(2,4)(5,7)(6,10)(8,15)(9,14)(11,18)(12,13)(16,20)(17,19)(23,30)(26,35)(27,36)(31,33) involution — undirected(7,14)(10,13)(15,20)(18,19)(21,23)(22,27)(24,33)(25,30)(26,29)(28,36)(31,34)(32,35) involution — undirected(5,8,9,16)(6,11,12,17)(7,15,14,20)(10,18,13,19)(22,28)(26,35)(27,36)(29,32)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.