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