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