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