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