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