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