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