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