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