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