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