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