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