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)(23,27)(24,28)(25,26)(29,34)(30,33)(31,32)(35,36)(5,7,9,12)(6,10,11,8)(14,17)(18,20)(22,26)(27,33)(28,31)(34,35)(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)(29,35)(30,33)(34,36) involution — undirected(1,2)(3,4)(5,7)(6,8)(9,12)(10,11)(21,23,25,30)(22,27,26,33)(24,29,32,36)(28,34,31,35)(5,8)(6,7)(9,10)(11,12)(13,15,16,19)(14,18,17,20)(21,24,25,32)(22,28,26,31)(23,29,30,36)(27,34,33,35)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.