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