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