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