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