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)(14,17)(15,19)(21,22,26,29)(23,24,30,27)(25,33,34,28)(31,35,36,32)(5,6,9,10)(7,8,11,12)(13,14)(15,18)(16,17)(19,20)(23,30)(24,27)(31,36)(32,35)(6,10)(8,12)(13,14)(15,20)(16,17)(18,19)(21,23)(22,27)(24,29)(25,31)(26,30)(28,35)(32,33)(34,36) involution — undirected(1,2,3,4)(5,7,9,11)(6,8,10,12)(21,24,26,27)(22,23,29,30)(25,32,34,35)(28,31,33,36)(5,8)(6,11)(7,10)(9,12)(13,15)(14,18)(16,19)(17,20)(21,25,26,34)(22,28,29,33)(23,31,30,36)(24,32,27,35)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.