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