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