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