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