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