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