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