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