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