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