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