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