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