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