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