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