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