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