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)(13,14,16,18)(15,17,19,20)(21,22,26,27,25,28,24,30)(23,31,34,36,33,29,32,35)(5,7,8,11)(6,9,10,12)(13,15)(14,17)(16,19)(18,20)(22,27)(23,32)(24,26)(28,30)(33,34)(35,36)(6,10)(9,12)(15,19)(17,20)(22,28)(27,30)(29,31)(35,36) involution — undirected(2,4)(21,23,24,32,25,33,26,34)(22,29,30,36,28,31,27,35)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.