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