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