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