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