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