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