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