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