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