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)(25,26,31,35)(27,29,33,40)(28,34,30,32)(36,39,37,38)(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)(26,29)(28,36)(30,37)(31,33)(32,38)(34,39)(35,40)(1,2)(3,5)(4,6)(7,8)(9,10,13,16)(11,14,17,18)(12,15,21,20)(19,22,23,24)(25,28,31,30)(26,32,35,34)(27,36,33,37)(29,38,40,39)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,15)(13,16)(17,18)(19,22)(20,21)(23,24)(9,11,13,17)(10,14,16,18)(12,19,21,23)(15,22,20,24)(25,29)(26,33)(27,35)(28,38)(30,39)(31,40)(32,37)(34,36)(9,12)(10,15)(11,19)(13,21)(14,22)(16,20)(17,23)(18,24)(25,30,31,28)(26,34,35,32)(27,37,33,36)(29,39,40,38)A 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.