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