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)(21,22)(23,25)(24,26)(27,32)(28,30)(29,31)(33,34)(35,36) involution — undirected(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23,27,30)(22,28,32,25)(24,29,31,26)(33,35,36,34)(1,2,3,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24,28,34,27,31,25,35)(22,29,30,36,32,26,23,33)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,25,27,28)(22,30,32,23)(24,34,31,35)(26,36,29,33)(7,17)(11,14)(15,16)(19,20)(21,26,28,33,27,29,25,36)(22,31,30,35,32,24,23,34)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.