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