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