One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6,9,11)(7,8,12,10)(13,14,16,18)(15,19,20,17)(21,22,25,28)(23,26,31,29)(24,27,32,34)(30,33,36,35)(5,7,9,12)(6,10,11,8)(13,15,16,20)(14,17,18,19)(21,22,25,28)(23,29,31,26)(24,27,32,34)(30,35,36,33)(1,3,4,2)(6,11)(7,12)(13,15,16,20)(14,17,18,19)(21,22)(23,26)(24,27)(25,28)(29,31)(30,33)(32,34)(35,36)(5,7)(6,8)(9,12)(10,11)(13,15)(14,17)(16,20)(18,19)(21,23)(22,26)(24,30)(25,31)(27,33)(28,29)(32,36)(34,35) involution — undirected(5,8)(6,7)(9,10)(11,12)(13,14)(15,17)(16,18)(19,20)(21,24,25,32)(22,27,28,34)(23,30,31,36)(26,33,29,35)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.