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