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