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