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