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)(23,29)(24,35)(25,30)(26,31)(27,33)(28,32)(34,36) involution — undirected(1,2)(3,4)(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23)(22,29)(24,31)(25,28)(26,35)(27,34)(30,32)(33,36) involution — undirected(2,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24,27,30,28,36,26,29)(22,25,31,35,32,23,33,34)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,25,28,23)(22,30,32,29)(24,31,36,33)(26,34,27,35)(2,4)(7,17)(11,14)(15,16)(19,20)(21,26,28,27)(22,31,32,33)(23,34,25,35)(24,29,36,30)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.