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