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