One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,17)(12,15)(13,16)(14,19)(18,23)(20,22)(21,24)(25,26,29,33,28,32,37,31)(27,34,36,40,35,30,38,39)(1,2)(3,7)(4,8)(5,6)(9,11)(10,14)(12,18)(13,19)(15,21)(16,17)(20,24)(22,23)(25,27)(26,30)(28,35)(29,36)(31,40)(32,34)(33,39)(37,38) involution — undirected(2,6)(7,8)(9,12,13,20)(10,15,16,22)(11,18,19,24)(14,21,17,23)(26,31)(27,35)(29,37)(30,39)(32,33)(34,40)(1,3,5,4)(2,7,6,8)(10,16)(14,17)(15,22)(21,23)(26,32)(27,35)(31,33)(36,38)(1,4,5,3)(2,7,6,8)(11,19)(14,17)(18,24)(21,23)(26,32)(30,34)(31,33)(39,40)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.