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