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