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