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