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