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