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