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