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