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