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