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