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