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