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