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