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