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