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