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