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