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)(21,22,27,31)(23,32,25,35)(24,29,26,36)(28,34,30,33)(2,4)(21,23,27,25)(22,28,31,30)(24,33,26,34)(29,35,36,32)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(21,24,27,26)(22,29,31,36)(23,33,25,34)(28,35,30,32)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,25,27,23)(22,30,31,28)(24,34,26,33)(29,32,36,35)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.