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