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