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