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