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