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