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