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