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