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)(23,29)(24,27)(25,28)(26,31)(30,33)(32,35)(34,36) involution — undirected(1,2,4,3)(5,6)(7,14)(8,12)(9,18)(10,13)(11,16)(15,19)(17,20)(21,23,25,31)(22,26,28,29)(24,30,32,36)(27,34,35,33)(5,7,10,17)(6,11,13,19)(8,16,9,15)(12,20,18,14)(21,24)(22,27)(23,30)(25,32)(26,33)(28,35)(29,34)(31,36)(1,3,4,2)(22,28)(24,32)(26,29)(30,36)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.