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