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