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