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