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