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)(23,29)(24,27)(25,28)(26,31)(30,35)(32,34)(33,36)(7,13)(11,17)(14,19)(18,20)(21,22,25,28)(23,26,31,29)(24,27,32,34)(30,33,36,35)(6,10)(11,17)(12,15)(18,20)(21,22)(23,26)(24,27)(25,28)(29,31)(30,33)(32,34)(35,36) involution — undirected(5,6)(7,11)(8,12)(9,10)(13,17)(14,18)(15,16)(19,20)(21,23)(22,26)(24,30)(25,31)(27,33)(28,29)(32,36)(34,35) involution — undirected(1,3,4,2)(5,7)(6,11)(8,14)(9,13)(10,17)(12,18)(15,20)(16,19)(5,8)(6,12)(7,14)(9,16)(10,15)(11,18)(13,19)(17,20)(21,24,25,32)(22,27,28,34)(23,30,31,36)(26,33,29,35)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.