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