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