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