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