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