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