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