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