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