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