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)(23,26)(24,27)(25,30)(28,33)(29,32)(31,35)(34,36)(8,15)(11,13)(16,20)(18,19)(21,22,26,23)(24,29,32,27)(25,28,33,30)(31,35,36,34)(6,7)(11,13)(12,14)(18,19)(22,23)(27,29)(28,30)(34,35) involution — undirected(5,7,10,6)(8,13,15,11)(9,14,17,12)(16,19,20,18)(21,23,26,22)(24,29,32,27)(25,30,33,28)(31,35,36,34)(1,3,4,2)(5,8,10,15)(6,11,7,13)(9,16,17,20)(12,18,14,19)(21,24)(22,27)(23,29)(25,31)(26,32)(28,34)(30,35)(33,36)(5,9)(6,12)(7,14)(8,16)(10,17)(11,18)(13,19)(15,20)(21,25,26,33)(22,28,23,30)(24,31,32,36)(27,34,29,35)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.