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