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