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