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