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