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