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