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