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