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