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