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