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