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