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