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