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