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