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