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