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