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