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