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