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