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)(22,26)(27,33)(29,31)(34,36) involution — undirected(5,7)(6,11)(8,15)(9,18)(10,16)(12,19)(13,14)(17,20)(22,27)(23,30)(25,28)(26,33)(29,31)(32,35) involution — undirected(1,2,3,4)(21,22,28,33,24,26,25,27)(23,31,35,34,32,29,30,36)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(22,26)(27,33)(29,31)(34,36)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,23,25,30,24,32,28,35)(22,29,27,34,26,31,33,36)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.