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