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