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)(27,28)(29,37)(30,31)(32,39)(33,34)(35,38)(36,40)(1,2)(3,8)(4,6)(5,7)(9,11,14,18)(10,12,15,17)(13,19,22,24)(16,20,21,23)(25,26)(27,33)(28,34)(29,32)(30,31)(35,38)(36,40)(37,39)(1,3,5,6)(2,4,7,8)(10,15)(11,18)(16,21)(19,24)(26,31)(27,34)(32,37)(35,40)(1,2,5,7)(3,4,6,8)(9,10)(11,12)(13,16)(14,15)(17,18)(19,20)(21,22)(23,24)(25,27,30,34)(26,28,31,33)(29,35,39,40)(32,36,37,38)(1,2)(3,4)(5,7)(6,8)(9,12)(10,11)(13,20)(14,17)(15,18)(16,19)(21,24)(22,23)(25,28)(26,27)(29,38)(30,33)(31,34)(32,40)(35,37)(36,39) involution — undirected(1,4)(2,6)(3,7)(5,8)(9,13,14,22)(10,16,15,21)(11,19,18,24)(12,20,17,23)(25,29)(26,32)(27,35)(28,36)(30,39)(31,37)(33,38)(34,40)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.