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