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