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