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