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