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