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