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