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