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