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