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