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