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