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