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