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