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