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