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