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