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)(21,22,26,28,25,30,24,29)(23,27,33,34,31,35,32,36)(1,2)(3,4)(6,11)(7,9)(12,14)(13,16)(15,18)(19,20)(21,23)(22,27)(24,32)(25,31)(26,33)(28,34)(29,36)(30,35) involution — undirected(2,4)(5,7,10,9)(6,12,14,11)(8,15,17,18)(13,19,20,16)(22,28)(24,26)(27,34)(29,30)(32,33)(35,36)(5,8,10,17)(6,13,14,20)(7,15,9,18)(11,16,12,19)(23,31)(27,35)(32,33)(34,36)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.