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