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