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