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