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