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