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