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