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