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