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