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