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