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