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