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