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