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