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