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