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