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