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