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