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