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