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