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