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