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