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