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