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