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