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