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