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