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