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