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