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