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