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