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