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