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