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