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