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