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