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