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