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