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