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