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