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