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