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