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)(11,15)(12,16)(13,21)(14,18)(17,23)(19,20)(22,24)(2,4)(6,7)(9,11,14,16)(10,15,18,12)(13,19,23,24)(17,22,21,20)(25,26,31,28)(27,34,32,29)(30,33,39,36)(35,38,40,37)(9,10,14,18)(11,12,16,15)(13,17,23,21)(19,20,24,22)(25,27)(26,29)(28,34)(30,35)(31,32)(33,37)(36,38)(39,40)(1,3)(2,6)(4,7)(5,8)(9,10)(11,15)(12,16)(13,17)(14,18)(19,22)(20,24)(21,23)(25,28,31,26)(27,34,32,29)(30,36,39,33)(35,38,40,37)(1,4,5,2)(3,7,8,6)(9,12,14,15)(10,16,18,11)(13,22,23,20)(17,19,21,24)(25,29,31,34)(26,32,28,27)(30,38,39,37)(33,35,36,40)(1,3)(2,7)(4,6)(5,8)(9,13)(10,17)(11,19)(12,20)(14,23)(15,22)(16,24)(18,21)(25,30)(26,33)(27,35)(28,36)(29,37)(31,39)(32,40)(34,38) 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.